<!DOCTYPE html>
<html lang="en">

<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <title>QSKJ_LOCAL</title>
    <script type="text/javascript" src="/Public/Build/Cesium/Cesium.js"></script>
    <script src="/Public/js/jquery-3.7.1.min.js"></script>
    <script src="/Public/js/utilsForCesium.js"></script>
    <link rel="stylesheet" href="/Public/Build/Cesium/Widgets/widgets.css">
    <style>
        .camera-info {
            position: absolute;
            display: flex;
        }

        .camera-info>span {
            margin-left: 20px;
            color: white;
            font-size: 20px;
            font-weight: 800;
            z-index: 450;
        }
    </style>
</head>

<body>
    <div id="cesiumContainer">
        <div class="camera-info">
            <span id="c-heading"></span>
            <span id="c-pitch"></span>
            <span id="c-jd"></span>
            <span id="c-wd"></span>
            <span id="c-height"></span>
        </div>
    </div>
    <script>
        Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI0MjczNDgzMy1hYzE1LTRjNWYtODZhMS01MjZkNWRiMDc2MmUiLCJpZCI6ODIxMzAsImlhdCI6MTY0NDU0ODc0M30.LpGXXWsbQXucV5MTeC2g8BCAQWiZp612gosWcK-7ocE';

        const viewer = new Cesium.Viewer('cesiumContainer', {
            terrain: Cesium.Terrain.fromWorldTerrain(),
        });

        viewer.camera.changed.addEventListener(() => {
            let heading = Cesium.Math.toDegrees(viewer.camera.heading).toFixed(2)
            let pitch = Cesium.Math.toDegrees(viewer.camera.pitch).toFixed(2)
            let viewHeight = viewer.camera.positionCartographic.height.toFixed(2)
            var positionCartographic = Cesium.Cartographic.fromCartesian(viewer.camera.position);
            var longitude = Cesium.Math.toDegrees(positionCartographic.longitude).toFixed(2);
            var latitude = Cesium.Math.toDegrees(positionCartographic.latitude).toFixed(2);
            var height = positionCartographic.height.toFixed(2);
            $("#c-heading").text(`heading:${heading}`)
            $("#c-pitch").text(`pitch:${pitch}`)
            $("#c-jd").text(`视角经度:${longitude}`)
            $("#c-wd").text(`视角纬度:${latitude}`)
            $("#c-height").text(`视角高度:${height}`)

        })
        // viewer.scene.globe.show = false;

        $.get("/Public/data/nature_reserve.json", {}, function (data) {
            data.features.forEach(feature => {
                const pls = feature.geometry.rings[0]

                var pts = []
                pls.forEach(pl => {
                    pts.push(pl[0])
                    pts.push(pl[1])
                })

                // let area = 0, centroidX = 0, centroidY = 0;
                // for(let i=0;i<pls.length-1;i++){
                //     const x1 = pls[i][0]
                //     const y1 = pls[i][1]
                   
                //     const x2 = pls[i+1][0]
                //     const y2 = pls[i+1][1]
                //     const cross = x1*y2 - x2*y1;
                //     area += cross;
                //     centroidX += (x1 + x2) * cross;
                //     centroidY += (y1 + y2) * cross;
                // }
                // area /= 2;
                // centroidX /= 6 * area;
                // centroidY /= 6 * area; 
                // console.log(centroidX,centroidY)
                
                getCentroid(pls)

                viewer.entities.add({
                    position: Cesium.Cartesian3.fromDegrees(getCentroid(pls)[0], getCentroid(pls)[1]),
                    label: {
                        text: feature.attributes.name,
                        font: "16px sans-serif",
                        showBackground: true,
                        backgroundColor: new Cesium.Color.fromBytes(0, 70, 24),
                        heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
                        eyeOffset: new Cesium.Cartesian3(0, 0, -2000),
                        pixelOffset: new Cesium.Cartesian2(0, -30),
                    },
                });

                const wall = new Cesium.WallGeometry({
                    positions: Cesium.Cartesian3.fromDegreesArray(pts),
                    maximumHeights: new Array(pts.length).fill(5000),
                    minimunHeights: new Array(pts.length).fill(0),
                })

                const geometry = Cesium.WallGeometry.createGeometry(wall);

                const instance = new Cesium.GeometryInstance({
                    geometry: geometry,

                })
                const materialAppearance = new Cesium.MaterialAppearance({
                    material: Cesium.Material.fromType('Color', {
                        // color: new Cesium.Color(0.0, 1.0, 0.0, 1.0)
                        color: Cesium.Color.fromAlpha(Cesium.Color.MEDIUMTURQUOISE, 0.2)
                    }),
                    faceForward: true
                });

                viewer.scene.groundPrimitives.add(new Cesium.Primitive({
                    geometryInstances: instance,
                    appearance: materialAppearance

                }));

                viewer.camera.setView({
                    destination: Cesium.Cartesian3.fromDegrees(
                        102.68, 29.73,
                        39929.52
                    ),
                    orientation: {
                        heading: Cesium.Math.toRadians(347.29),
                        pitch: Cesium.Math.toRadians(-39.84),
                        roll: 0.0,
                    },
                });

            })
        })
    </script>
    </div>
</body>

</html>